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MCP live MCP 2026-07-28 streamable-http

Payload Validator

com.gumballtools/payload-validator

Validate JSON, YAML, XML and CSV with exact line/column errors and silent-corruption warnings.

Watch this dependency Share evidence report
Uptime
100.0%
5 direct probes · 30d
Response
1213ms
last probe
Tools
5
callable
Resources
0
readable
Prompts
0
available
Primary URL
https://payload-validator.gumballtools.com/api/mcp
Score: 100/100
Handshake verified by our own probe.
pass Answers the MCP handshake 50/50
The handshake and the list calls succeeded on the primary URL.
pass Lists tools, resources or prompts 30/30
5 tools, 0 resources, 0 prompts returned.
pass 3 or more catalogue items 10/10
5 items in total; 3 or more earns these points.
pass Describes itself 10/10
94 characters; more than 30 earns these points.

Tools · 5

validate_json

Validates a JSON document and reports every problem with an exact line and column. Use this whenever you need to know why a JSON payload is failing, or to check a JSON document you or a user produced…

validate_yaml

Validates a YAML document, including the values that mean different things to different YAML loaders. Use this for any YAML you are about to write or have just been given — CI configs, Kubernetes man…

validate_xml

Validates an XML document for well-formedness, namespace correctness, and the entity-based attacks that arrive as XML. Use this before parsing XML you received, and when an XML document is being reje…

validate_csv

Validates CSV text against RFC 4180 and reports ragged rows individually, with both field counts. Use this before loading a CSV, and whenever a CSV-derived number looks wrong. Do not attempt this by…

validate_auto

Detects whether a payload is JSON, YAML, XML or CSV, then validates it. Use this when you have a blob of text and do not know what it is — a file with no extension, a clipboard paste, a response body…

How to use

Claude Desktop or claude.ai: add a custom connector (Customize → Connectors; on Team and Enterprise plans an owner adds it under Organization settings → Connectors) with this server URL: https://payload-validator.gumballtools.com/api/mcp

Cursor or Cline: add to your MCP config:

{
  "mcpServers": {
    "payload_validator": {
      "url": "https://payload-validator.gumballtools.com/api/mcp",
      "transport": "streamable-http"
    }
  }
}